Hey , I am having a landing page with anonymous users . I am planning to implement this using bigquery . So I was planning to generate a unique id to give this as an attribute to growthbook . What is the recommended method to create a unique user id ? Since this is a landing page with no logged in users.

its recommended to use an id that the other tracking system uses

I am using javascript sdk . So in that case is it okay generate a random unique id from front end ?

well, for that ID to be useful, you’ll have to make it persistent